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<div><a href="../index.html">Home</a> &gt;  <a href="index.html">fvcom_prepro</a> &gt; smoothfield2.m</div>

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<h1>smoothfield2
</h1>

<h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="box"><strong>Smooth a vertex-based field using minimum value of surrounding nodes</strong></div>

<h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="box"><strong>function [field]  = smoothfield(fieldin,Mobj,nLoops,SmoothPts) </strong></div>

<h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="fragment"><pre class="comment"> Smooth a vertex-based field using minimum value of surrounding nodes 

 [field] = function smoothfield(fieldin,Mobj,nLoops,SmoothPts)  

 DESCRIPTION:
    Smooth a vertex based field 

 INPUT
    Mobj         = Matlab mesh object
    fielin       = vertex based field
    nLoops       = number of smoothing iterations
    SmoothPts    = list of vertices to smooth [optional, default = all]

 OUTPUT:
    field = smoothed, vertex-based field

 EXAMPLE USAGE
    Mobj.h = smoothfield(Mobj.h,Mobj,0.5,4)

 Author(s):  
    Geoff Cowles (University of Massachusetts Dartmouth)

 Revision history
   
==============================================================================</pre></div>

<!-- crossreference -->
<h2><a name="_cross"></a>CROSS-REFERENCE INFORMATION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
This function calls:
<ul style="list-style-image:url(../matlabicon.gif)">
</ul>
This function is called by:
<ul style="list-style-image:url(../matlabicon.gif)">
</ul>
<!-- crossreference -->



<h2><a name="_source"></a>SOURCE CODE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="fragment"><pre>0001 <a name="_sub0" href="#_subfunctions" class="code">function [field]  = smoothfield(fieldin,Mobj,nLoops,SmoothPts)</a>
0002 
0003 <span class="comment">% Smooth a vertex-based field using minimum value of surrounding nodes</span>
0004 <span class="comment">%</span>
0005 <span class="comment">% [field] = function smoothfield(fieldin,Mobj,nLoops,SmoothPts)</span>
0006 <span class="comment">%</span>
0007 <span class="comment">% DESCRIPTION:</span>
0008 <span class="comment">%    Smooth a vertex based field</span>
0009 <span class="comment">%</span>
0010 <span class="comment">% INPUT</span>
0011 <span class="comment">%    Mobj         = Matlab mesh object</span>
0012 <span class="comment">%    fielin       = vertex based field</span>
0013 <span class="comment">%    nLoops       = number of smoothing iterations</span>
0014 <span class="comment">%    SmoothPts    = list of vertices to smooth [optional, default = all]</span>
0015 <span class="comment">%</span>
0016 <span class="comment">% OUTPUT:</span>
0017 <span class="comment">%    field = smoothed, vertex-based field</span>
0018 <span class="comment">%</span>
0019 <span class="comment">% EXAMPLE USAGE</span>
0020 <span class="comment">%    Mobj.h = smoothfield(Mobj.h,Mobj,0.5,4)</span>
0021 <span class="comment">%</span>
0022 <span class="comment">% Author(s):</span>
0023 <span class="comment">%    Geoff Cowles (University of Massachusetts Dartmouth)</span>
0024 <span class="comment">%</span>
0025 <span class="comment">% Revision history</span>
0026 <span class="comment">%</span>
0027 <span class="comment">%==============================================================================</span>
0028 subname = <span class="string">'smoothfield'</span>;
0029 <span class="comment">%fprintf('\n')</span>
0030 <span class="comment">%fprintf(['begin : ' subname '\n'])</span>
0031 
0032 <span class="comment">%------------------------------------------------------------------------------</span>
0033 <span class="comment">% Parse input</span>
0034 <span class="comment">%------------------------------------------------------------------------------</span>
0035 
0036 <span class="keyword">if</span>(exist(<span class="string">'fieldin'</span>)*exist(<span class="string">'Mobj'</span>)*exist(<span class="string">'nLoops'</span>) == 0)
0037     error(<span class="string">'arguments to smoothfield are missing'</span>)
0038 <span class="keyword">end</span>;
0039 
0040 <span class="keyword">if</span>(exist(<span class="string">'SmoothPts'</span>))
0041     nPts = length(SmoothPts);
0042 <span class="keyword">else</span>
0043     nPts       = Mobj.nVerts;
0044     SmoothPts  = 1:Mobj.nVerts;
0045 <span class="keyword">end</span>;
0046 
0047 <span class="keyword">if</span>(~Mobj.have_mets)
0048     error(<span class="string">'cannot smooth field, need mesh metrics for smoothing, use setup_metrics'</span>)
0049 <span class="keyword">end</span>;
0050 
0051 <span class="comment">%------------------------------------------------------------------------------</span>
0052 <span class="comment">% Smoothing Loops</span>
0053 <span class="comment">%------------------------------------------------------------------------------</span>
0054 
0055 <span class="comment">% initialize iteration</span>
0056 field = fieldin;
0057 
0058 <span class="comment">%iterate</span>
0059 <span class="keyword">for</span> ll=1:nLoops;
0060     field = fieldin;
0061     <span class="keyword">for</span> ii=1:nPts;
0062           i = SmoothPts(ii);
0063           <span class="keyword">for</span> k=1:Mobj.ntsn(i); 
0064               node = Mobj.nbsn(i,k);
0065                   <span class="keyword">if</span>(abs(field(node)) &lt; abs(field(i))); fieldin(i) = field(node); <span class="keyword">end</span>;
0066           <span class="keyword">end</span>;
0067     <span class="keyword">end</span>;
0068 <span class="keyword">end</span>;
0069 field = fieldin; 
0070 
0071 
0072 <span class="comment">%fprintf(['end   : ' subname '\n'])</span>
0073</pre></div>
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